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Name: A local police department near a large mall has decided to step up tra
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Description: A local police department near a large mall has decided to step up traffic enforcement during the months of November and December this year. They are concerned that the number of people speeding has increased this year. The number of speeding violati

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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A local police department near a large mall has decided to step up traffic enforcement during the months of November and December this year. They are concerned that the number of people speeding has increased this year. The number of speeding violations for 11 randomly selected days was recorded. Here are the results for those 11 randomly selected days.

13 8 10 10 4 17 9 16 10 12 12

a. Construct a 90% confidence interval for μμ = the true mean number of speeding violations given out daily during the months of November and December.

b. Interpret the confidence interval.

c. Last year, the police department gave out an average of 8.4 speeding tickets daily. Does it appear as if more speeding tickets were given out this year?

Definition Definition Measure of central tendency that is the average of a given data set. The mean value is evaluated as the quotient of the sum of all observations by the sample size. The mean, in contrast to a median, is affected by extreme values. Very large or very small values can distract the mean from the center of the data. Arithmetic mean: The most common type of mean is the arithmetic mean. It is evaluated using the formula: μ = 1 N ∑ i = 1 N x i Other types of means are the geometric mean, logarithmic mean, and harmonic mean. Geometric mean: The nth root of the product of n observations from a data set is defined as the geometric mean of the set: G = x 1 x 2 ... x n n Logarithmic mean: The difference of the natural logarithms of the two numbers, divided by the difference between the numbers is the logarithmic mean of the two numbers. The logarithmic mean is used particularly in heat transfer and mass transfer. ln x 2 − ln x 1 x 2 − x 1 Harmonic mean: The inverse of the arithmetic mean of the inverses of all the numbers in a data set is the harmonic mean of the data. 1 1 x 1 + 1 x 2 + ...

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